EP2338386A1 - Siebfilter für Entsafter - Google Patents

Siebfilter für Entsafter Download PDF

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Publication number
EP2338386A1
EP2338386A1 EP09180791A EP09180791A EP2338386A1 EP 2338386 A1 EP2338386 A1 EP 2338386A1 EP 09180791 A EP09180791 A EP 09180791A EP 09180791 A EP09180791 A EP 09180791A EP 2338386 A1 EP2338386 A1 EP 2338386A1
Authority
EP
European Patent Office
Prior art keywords
sieve
filter
frontal
holes
sieve filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09180791A
Other languages
English (en)
French (fr)
Inventor
Juergen Holzbauer
Ines Fister
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP09180791A priority Critical patent/EP2338386A1/de
Publication of EP2338386A1 publication Critical patent/EP2338386A1/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J19/00—Household machines for straining foodstuffs; Household implements for mashing or straining foodstuffs
    • A47J19/02—Citrus fruit squeezers; Other fruit juice extracting devices
    • A47J19/027—Centrifugal extractors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0039—Inorganic membrane manufacture
    • B01D67/0053—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes
    • B01D67/006—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes by elimination of segments of the precursor, e.g. nucleation-track membranes, lithography or laser methods
    • B01D67/0062—Inorganic membrane manufacture by inducing porosity into non porous precursor membranes by elimination of segments of the precursor, e.g. nucleation-track membranes, lithography or laser methods by micromachining techniques, e.g. using masking and etching steps, photolithography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0039—Inorganic membrane manufacture
    • B01D67/0069—Inorganic membrane manufacture by deposition from the liquid phase, e.g. electrochemical deposition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/022—Metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469—Perforated sheet-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/02—Details relating to pores or porosity of the membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/02—Details relating to pores or porosity of the membranes
    • B01D2325/021—Pore shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/02—Details relating to pores or porosity of the membranes
    • B01D2325/0283—Pore size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2325/00—Details relating to properties of membranes
    • B01D2325/04—Characteristic thickness

Definitions

  • the present invention relates to a sieve filter for filtering a juice comprising fluid and fibrous content, the sieve filter having a frontal surface and an aft surface and a plurality of filter holes extending between the frontal and aft surface.
  • DE-A-1157200 discloses a number of embodiments of a sieve for separating a fluid mixed with solids.
  • a sieve is disclosed with filter holes that are perpendicular to the surface of the sieve.
  • the walls of the filter holes appear to be at an angle with the sieve major surface, with a different angle at the top and the bottom of the filter hole.
  • improved separation of fluid and solid can be achieved by having a sharp angle between the surface and the filter hole axis, and even further improved by having a sinusoid surface of the sieve.
  • the present invention seeks to provide an improved sieve filter, which is easier and more simply to clean in everyday use.
  • a sieve filter according to the preamble defined above wherein each of the plurality of filter holes has a sieve hole surface which transitions into the frontal surface in a continuous manner. This eliminates that fibers of a fiber/juice mixture get trapped on the sharp edges of the holes, which results in a much easier cleaning capability of the sieve filter.
  • the sieve hole surface transitions into the frontal surface with a transition radius of at least half a thickness of the sieve filter. In many applications, this translates in an embodiment of the sieve filter wherein the sieve hole surface transitions into the frontal surface with a transition radius of at least 0.04mm. In a further embodiment, the sieve hole surface transitions into the frontal surface with a transition radius of between 0.07mm and 0.10mm. All these embodiments provide a sufficient cleaning capability of the sieve filter.
  • the sieve hole surface transitions into the aft surface in a manner similar to the transition of the sieve hole surface into the front surface.
  • a cross section of the hole perpendicular to the frontal surface has a circular shape. This embodiment combines the symmetric shape, as well as the highest value of curvature of the sieve hole surface, thereby making the chance of fibers sticking in the sieve filter minimal.
  • a cross section of the hole perpendicular to the frontal surface has a semi-circular shape. On the frontal surface, the curvature is then maximized, and thus easier to clean.
  • the sieve hole surface transitions into the frontal surface with a transition radius, and the sieve hole surface transitions into the aft surface with a secondary transition radius in a further embodiment, the transition radius being different from the secondary transition radius.
  • the present invention relates to a method of manufacturing a sieve filter according to any one of the embodiments disclosed herein, comprising: using a galvano process for forming the plurality of filter holes in a sheet of material.
  • the method comprises using a photo-edging process for forming the plurality of filter holes in a sheet of material, and rounding the hole edges by sand blasting or by electro-polishing.
  • the present invention relates to a centrifugal juicer comprising a sieve filter according to any one of the embodiments disclosed herein.
  • Fig. 1 shows a cross sectional view of a sieve filter 1, having a frontal surface 2 and an aft surface 3, and a plurality of filter holes 4 extending between the frontal surface 2 and aft surface 3.
  • a mixture of juice and fibers is at the frontal surface 2, and a plurality of holes 4 allow the juice only to pass (in an ideal situation) to exit from the aft surface 3.
  • the sieve filter 1 is generally flat, i.e. the front and aft surface 2, 3 are flat surfaces, and a thickness of the sieve filter 1 is indicated in the figures with the reference d.
  • the sieve filter 1 may be a round or circular filter, used in e.g. a centrifugal juicer, but other shapes such as rectangular or square are also possible.
  • Fig. 2 shows a detail of a filter 1 according to the prior art.
  • the holes 4 in the filter 1 are made using stamping or edging techniques, as a result of which the transition between the filter surfaces (frontal surface 2 and aft surface 3) and a hole surface 5 is very sharp (i.e. a transition radius of 0.001 to 0.02 mm).
  • a transition radius of 0.001 to 0.02 mm At this sharp corners, fruit fibers 6 can catch and lodge on very easily. This is because of the law of string-friction, the friction of a string is the higher, the smaller the radius it is wound around.
  • a sieve filter 1 for a centrifugal juicer which has continuously rounded holes 4, wherein a sieve hole surface 5 transitions from the (flat) frontal surface 2 of the filter 1 in a continuous manner, e.g. by having a rounding curvature.
  • the filters 1 do not have any sharp edges, where fibers 6 can grab onto (in this case the string-friction is very low, much lower than in present filters 1).
  • the holes 4 have a sieve hole surface 5 which is continuously rounded from the flat filter surface 2, 3 into the holes 4, so that fibers 6 can hardly get attached to the filter 1. By doing so the fibers 6 of fruits or vegetables can be cleaned out by a simple wipe with a standard sponge and a rinse with tab water.
  • a first embodiment of the sieve filter 1 according to the present embodiment is shown in a detailed sectional view of Fig. 3 .
  • the sieve filter 1 has a thickness d between a frontal surface 2 and an aft surface 3.
  • Each hole 4 in the filter 1 has a sieve hole surface 5, which transitions into the frontal surface 2 with a transition radius r 1 .
  • the transition radius r 1 is as large as possible in view of the thickness d of the filter 1, and in exemplary embodiments, the transition radius r 1 is at least 0.04 mm. In a further exemplary embodiment, the transition radius r 1 is at least equal to half the thickness d of the filter 1, i.e. r 1 > d/2.
  • a transition radius r 1 having a value between 0.07 and 0.10 mm provides very good results, i.e. a simple cleaning process where the fibers 6 can easily get wiped off of the holes 4 of the sieve filter 1 with standard household appliances, such as a sponge or brush.
  • the sieve filter 1 with rounded filter holes 4 as described herein is the first and only one that gets cleaned sufficiently in a dishwasher without any pre-treatment directly taken from the juicer.
  • the transition radius of the hole surface 5 towards the aft surface 3 is similar as the transition radius r 1 of the hole surface 5 towards the front surface 2, i.e. the sieve filter 1 is symmetric.
  • this is not necessarily, and asymmetric and other forms may be envisaged.
  • FIG. 4a A first example is shown in the cross sectional view of the embodiment of Fig. 4a , where the frontal surface 2 and aft surface 3 are parallel to each other, but the holes 4 are at an angle with the frontal and aft surface 2, 3, which is unequal to 90°. If the flow of the mixture of juice and fibers is taken to be upwards along frontal surface 2, the angle of the axis of the hole 4 and the frontal surface 2 is larger than 90°.
  • Fig. 4b an alternative to this embodiment is shown, where the fibers 6 are shown as flowing upward along the frontal surface 2, and the output flow of juice is indicated by reference numeral 8. In this alternative embodiment, the angle of the axis of the hole 4 and the frontal surface 2 is less than 90°.
  • the smallest transition radius r 1 of the hole surface 5 towards the frontal surface 2 is relevant, i.e. this transition radius r 1 is larger than a minimum value as indicated in the description of the embodiment in Fig. 3 .
  • the same transition radius r 1 is also present between the hole surface 5 and the aft surface 3 (but at a different spatial location, as indicated in Fig. 4 ).
  • the frontal and aft surface 2, 3 are depicted as being flat, however, these surfaces 2, 3 may have a different shape, e.g. slightly bent, or corrugated.
  • the hole surface has a donut shape, i.e. the material of the filter sieve 1 has a cross section in the shape of a circle with a radius equal to the transition radius r 1 (or a cross section of the holes 4 perpendicular to the frontal surface 2 has a circular shape).
  • the transition radius r 1 is equal to half of the thickness d of the filter sieve 1.
  • the transition radius r 1 is chosen as being equal to the sieve filter thickness d (in other words, the cross section of the hole 4 perpendicular to the frontal surface 2 has a semi-circular shape).
  • the transition of the hole surface 5 towards the aft surface 3 is sharper (e.g. as in present filter sieves 1), however, as in normal operation the fibers 6 will not reach this transition, also this embodiment will provide the improved results as mentioned in relation to the other embodiments.
  • a cross sectional view is shown of an even further embodiment, wherein the sieve hole surface 5 transitions into the frontal surface 2 with a transition radius r 1 (i.e. a first part 5a of the sieve hole surface 5 above a transition line 7 in Fig. 7 ), and the sieve hole surface 5 transitions into the aft surface 3 with a secondary transition radius r 2 (i.e. a second part 5b of the sieve hole surface 5 below the transition line 7 in Fig. 7 ), the transition radius r 1 being different from the secondary transition radius r 2 .
  • the secondary transition radius r 2 is much larger than the transition radius r 1 , i.e.
  • the cross section of the material of the sieve filter 1 is a combination of two half spheres.
  • the transition at the transition line 7 is not relevant for proper functioning of the sieve filter 1, but may also be rounded off.
  • the sieve hole surface 5 towards the frontal surface 2 may by cylindrical as shown, but also other forms are possible, such as exponential, oval or elliptic shapes, as long as the smallest transition radius r 1 fulfills the requirements as mentioned for these embodiments.
  • the sieve filter 1 is manufactured using a galvano process for forming the plurality of filter holes 4 in a sheet of material.
  • the sheet of material is e.g. nickel material.
  • the galvano process as is known as such to the skilled person, is an electro-deposition of metal ions of an electrolyte solution to a negatively charged cathode, resulting in a pure metal structure on the cathode surface.
  • a sieve filter 1 is manufactured using a photo-edging process for forming the plurality of filter holes 4 in a sheet of material, and by rounding the edges of the holes 4 by sand blasting or by electro-polishing, at least at the frontal surface of the sieve filter 1.
  • the sieve filter according to the present embodiments may be part of a centrifugal juicer or juice extractor, which can be used to provide juices from various fruits and/or vegetables.
  • the cleaning process involved for these juicers is simplified and made easier by using the present sieve filter 1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
EP09180791A 2009-12-28 2009-12-28 Siebfilter für Entsafter Withdrawn EP2338386A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09180791A EP2338386A1 (de) 2009-12-28 2009-12-28 Siebfilter für Entsafter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09180791A EP2338386A1 (de) 2009-12-28 2009-12-28 Siebfilter für Entsafter

Publications (1)

Publication Number Publication Date
EP2338386A1 true EP2338386A1 (de) 2011-06-29

Family

ID=42334054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09180791A Withdrawn EP2338386A1 (de) 2009-12-28 2009-12-28 Siebfilter für Entsafter

Country Status (1)

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EP (1) EP2338386A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157200B (de) 1962-02-08 1963-11-14 Buckau Wolf Maschf R Sieb zum Abscheiden von Feststoffen aus einem Feststoff-Fluessigkeits-Gemisch
CH680708A5 (en) * 1990-08-24 1992-10-30 Poretti & Gaggini S A Liq. filter with concentric filter tube - has conical holes through tube, larger in dia. at inner surface and with rounded inner edges, used for contaminated petroleum prods.
US5638960A (en) * 1993-07-22 1997-06-17 J.M. Voith Gmbh Sieve
DE10218084A1 (de) * 2002-04-23 2003-11-06 Fiedler Heinrich Gmbh Siebvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157200B (de) 1962-02-08 1963-11-14 Buckau Wolf Maschf R Sieb zum Abscheiden von Feststoffen aus einem Feststoff-Fluessigkeits-Gemisch
CH680708A5 (en) * 1990-08-24 1992-10-30 Poretti & Gaggini S A Liq. filter with concentric filter tube - has conical holes through tube, larger in dia. at inner surface and with rounded inner edges, used for contaminated petroleum prods.
US5638960A (en) * 1993-07-22 1997-06-17 J.M. Voith Gmbh Sieve
DE10218084A1 (de) * 2002-04-23 2003-11-06 Fiedler Heinrich Gmbh Siebvorrichtung

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